Date: Fri,  7 Dec 2012 14:58:45 +0000
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Search for relations/attributes and its values.

page - relation::object. e.g list all cities: is_a::city => relation=is_a&s=city

We search for both a relation and if the search is valid for attributes also, and OR combine the result.

An attribute has just a value, which is a number, and which is for sure no pagename, and its value goes through some units unification. (not yet)

We can also do numerical comparison and unit lifting with attributes:
*  population > 1000000
*  population > 1 million

Limitation:
* The backends can already do simple AND/OR combination of multiple relations and attributes to search for. Just the UI not. TODO: implement the AND/OR buttons.  population < 1 million AND area > 50 km2
* Due to attribute internals a relation search with matching attribute names will also find those attribute names, but not the values. You must explicitly search for attributes then.

The Advanced query can do a freeform query expression with multiple comparison and nesting.
* "is_a::city and population > 1.000.000 and population < 10.000.000"
* "(is_a::city or is_a::country) and population < 10.000.000"

== Usage ==

{{{
<<SemanticSearch arguments>>
}}}

== Arguments ==

All [[Help:PageList|PageList]] arguments, plus the following ones:

{| class="bordered"
|-
! Argument
! Description
! Default value
|-
| **s**
| linkvalue query string
| *
|-
| **page**
| which pages (glob allowed)
| ~* (all)
|-
| **relation**
| linkname. which relations.
| all
|-
| **attribute**
| linkname. which attributes.
| all
|-
| **attr_op**
| a funny written way for equality for pure aesthetic pleasure "All attributes which have this value set"
| ~:=
|-
| **units**
|
|
|-
| **case_exact**
|
| true
|-
| **regex**
| no word splitting, if no regex op is present, defaults to exact match
| auto
|-
| **noform**
| don't show form with results.
| false
|-
| **noheader**
| no caption
| false
|-
| **info**
| valid: pagename, relation, linkto, attribute, value and all other pagelist columns
| false
|}

== Example ==

{{{
<<SemanticSearch>>
}}}

<<SemanticSearch>>

== Author ==
* [[Help:Reini Urban|Reini Urban]]

== See Also ==
* [[Help:TitleSearchPlugin]]
* [[Help:FullTextSearchPlugin]]
* [[Help:ExternalSearchPlugin]]
* [[Help:InterWikiSearchPlugin]]

<noinclude>
----
[[PhpWikiDocumentation]] [[CategoryWikiPlugin]]
</noinclude>